Github user orhankislal commented on a diff in the pull request:
https://github.com/apache/incubator-madlib/pull/144#discussion_r124603434
--- Diff: src/ports/postgres/modules/graph/test/wcc.sql_in ---
@@ -0,0 +1,92 @@
+/* -----------------------------------------------------------------------
*//**
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ *//*
----------------------------------------------------------------------- */
+
+DROP TABLE IF EXISTS vertex, edge;
+CREATE TABLE vertex(
+vertex_id INTEGER
+);
+CREATE TABLE edge(
+src_node INTEGER,
+dest_node INTEGER,
+user_id INTEGER
+);
+INSERT INTO vertex VALUES
+(0),
+(1),
+(2),
+(3),
+(4),
+(5),
+(6),
+(10),
+(11),
+(12),
+(13),
+(14),
+(15),
+(16);
+INSERT INTO edge VALUES
+(0, 1, 1),
+(0, 2, 1),
+(1, 2, 1),
+(1, 3, 1),
+(2, 3, 1),
+(2, 5, 1),
+(2, 6, 1),
+(3, 0, 1),
+(5, 6, 1),
+(6, 3, 1),
+(10, 11, 2),
+(10, 12, 2),
+(11, 12, 2),
+(11, 13, 2),
+(12, 13, 2),
+(13, 10, 2),
+(15, 16, 2),
+(15, 14, 2);
+
+DROP TABLE IF EXISTS wcc_out;
+select weakly_connected_components(
--- End diff --
select -> SELECT
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